2 The factors affecting the friction between two solid objects November 24, 2014 by Heba Soffar · Published November 24, 2014 · Last modified February 29, 2020
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2 Seeing coloured objects and mixing the coloured lights October 4, 2017 by Heba Soffar · Published October 4, 2017 · Last modified September 7, 2019
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